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Gyaan Maths
CBSE · Class 6-12
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Class 8 · Ganita Prakash
Unit 2 · Class 8Ganita Prakash
Power Play
Exponents, laws of exponents, negative and rational exponents.
Lessons
3 concepts
1
Laws Summary
All operations with same base: add exponents when multiplying, subtract when dividing, multiply when taking a power of a power.
2
Negative Exponents
2
−
3
=
1
/
2
3
=
1
/
8
2^{-3} = 1/2^3 = 1/8
2
−
3
=
1/
2
3
=
1/8
. Negative exponent means reciprocal.
3
Standard Form
Very large/small numbers as
a
×
10
n
a\times 10^n
a
×
1
0
n
.
60000
=
6
×
10
4
60000 = 6\times 10^4
60000
=
6
×
1
0
4
;
0.00023
=
2.3
×
10
−
4
0.00023 = 2.3\times 10^{-4}
0.00023
=
2.3
×
1
0
−
4
.
Skills to practise
Skill · medium
Power Play — Practice